Sewing-machine motor mechanism.



R. P. HOWARD. SEWING MA CHINE MOTOR MECHANISM.

I APPLICATION FILED JANA, 1909.

7,80% Patented Mar. 28

2 SHEETS-SHEET 1.

I g. I M m M n n w 1 4 WW. 7

R. P. HOWARD. SEWING MACHINE MOTOR MECHANISM.

APPLICATION FILED JAN.4,1909,

2 8HBBTSSHEET 2 5L I l I J INIENTOA.

Patented Mar. 28

' that is used to drive manually Application filed January 4, 19%. Serial No. 470,6.

Specification of Letters Pet-en OBERT F. HQVJABD, OF KANSAS CITY,

K11 fhl'SEiS.

SEWING-MACHINE MOTOR IlEECHAlVISTAiI.

To aZZ whom it may concern:

Be it known that l Bonner F. Hownnn, u

citizen of the United States, residing at Kansas City, in the county of llynndotte and State of Kansas, have invented a certain new and useful improvement in Sewing Mechine Motor ivlcchunisms, of which the following is u specification.

My invention relates to improvements in sewing machines.

It relates particularly to sewing machine motor mechanisms. The object ofmy invention is to provide a motor mechun ism for sewing machines which will permit the head of the sewing machine to be swung to and from its normal position without liability of 'diserrzmgenient of or damage to the motor n'iechunisin.

A further object of thy invention is to provide a construction in which the motor mechanism for operating the sewing machine may be readily applied to the ordinary muchines ulrent y onthe .HIHI'lIClL. To eccon plish this object the preferred construction en' hodies a leg, adapted to replace one of the legs with which the sewing machine is providcd, and a motor mechanism carried by the leg, the leg and motor mechanism comprising a self contained mechanism attachable to and detachable from the table of a sewing machine as a unit. By means of such a construction the self contained mechanism may be manufactured as a unitary structure, Which may be sold separately from the sowing machines and applied to any of theordinary types of sewing machines, already in use, by substituting the unitary structure for one of the legs of a. machine.

In. the preferred form of my invention, the unitary structure embodies a belt Wheel. adapted to receivethereon the ordinary belt driven sewing "machines of a common type.

Otherrnovel features of my invention are:

hereinafter fully described and claimed.

In the accompanying drawings illustrating. a preferred form of my invention provided With spring motor mechanism, Figure 1 is a front elevation of a sewing machine provided with my invention. Fig. 2 is an end elevation of the same. Fig. 3 is a vertical sectionul View, enlarged, taken on the dotted line ab of Fig. l, of the motor mechanism attached to the leg, a portion of "which: is shown attached to a sewing machine table, which is partly hrohen sway. Fig. lnis I Vertical seclimiel View tel-zen on the dotted line 0-42 of his; 55. Fig". 5 an end elcvntion of the wool znism shown in Fig. 2 loot-:- ing at the opposite end from that shown in Fig. .2, the table and ports supported thereby being omitted similar parts. i

.l denotes the tuhle of on ordinary sowing nmchine, the head supported therelo-y, the shaft relatively mounted in the head and having uttoched thereto the ordinary pcriphcrully grooved pulley -fl: lltifilllgf; mounted. thereon tht-Hbclt 5 con'nnonly employed for driying such mncliines.

(3 denotes the orcliiiur h the corresponding leg at machine heinp; removed and suhst it u ted the etor,

l will now descrihc the unitary structure which is substituted for one of th sewing machine legs.

Preferably the leg comprises :1 foot portion 7 halving secured to upper end u casing portion adopted to contain the meto:' mechanism. Tlhe upper end. of the cusing portion 8 is provided with horizontal outwardly extending flanges l) which are secured to the under side of the table 1 in any desired manner as by screws l0. The casing may he of any desired construction host adapted to the motor mechanism to he employed, it is preferably detuchuhly connected with the foot portion, so that u toot portion oit uny desired height may he so cured to it.

of the machine other end of the in utt u clnncnt a horizont: l driv' shaft c2;- iihrouo'h and rotntively mounted n opposite W 4 of the casing portion 8, and having nu, mind on it outside the casing portion 8 :1 peripherally grooved pulley 12 adopted to receive thereon and drive the belt 5. I

A shaft 13 disposed below and parallel with the shaft 11 extends through and is rotutively mounted in opposite Walls of the casing: POIllOll 8. preferably of the convolute type, are secured at one set of ends to the shaft 13, the other set of ends being secured ton spur gear wheel rotutively within the casing portion The gear 15 meshes with a pinion 16 secured on a horizontul shaft "1.7 rotutiyely supported in op posite wells of the casing portion 8 eiid huving secured to it espur gear Whe l8 which tending i Sin'iiler characters of reference denote One or more springs ill,

Luis

mounted on the shaft meshes with a pinion 19 secured to a horizontal shaft 20 rotatively supported by opposite walls of the casing portion 8. On the shaft 20 is secured a spur gear wheel 21. which meshes with a pinion 22 secured on a horizontal shaft 23 rotativelysupported by opposite walls of the casing portion 8 and having secured to it a spur gear wheel 24 which meshes with a pinion 25 secured on the shaft 11. w i

To rotate the shaft 13 so as to wind the springs 14, said shaft has secured upon it adjacent to opposite ends and at opposite sides respectively of the casing portion 8, outside said casing portion, two ratchet -wheels 26 which are engaged respectively by two pawls 27 pivoted to the casing portion 8 at opposite ends thereof, said pawls being preferably normally held engaged with the ratchet wheels 26 by two springs 28 secured to the casing portion 8 and respectively bearing on the said pawls. The pawls 27 are disposed so as to prevent backward rotationof the shaft 13 after the springs 14: [have been Wound. j "0 wind the springs the following described mechanism is preferably employed. A U shaped lever 2.) has its arms pivoted on the shaft 13. Respcctively pivoted to the 30 two parallel arms of the lever 29 are two paw1s-30 respectively engaging-the ratchet wheels 26 with which the pawls are held in engagement by two springs 31 secured respectively to the parallel arms of the lever 29 and bearing respectively upon the pawls 30. To swing the lever 29, it is provided centrally with a forwardly extending projection 32 of inverted channel form and having in opposite vertical walls two longitudinal slots 33 in which are respectively mounted opposite ends of a horizontal pin.

34 secured transversely in the upper end of a lever and upon which the lever 3o swings. The said vertical Walls of the projection 32 are also provided respectively with longitudinal slots 36, which at their rear ends extend downwardly to the lower edges of said walls so as to receive therein the pin 37 extending transversely through the lever 35, below the pin 3 1, when the lever hangs vertically as shownin Figs. 2 and 5. A coil compression spring 38 is mounted in the projection 32 and at its forward end bears against the lever 35. lever 35 rearwardly thereby compressing the spring 38, the lever may be swung to the horizontal position, the pin 3'1 entering the slots 36 in which it is held by pressure of the spring 38 which forces the pin 37 and 0 lever 35 forward. The lever is thus releasably held in a horizontal position by the pin 37 being at the forward ends of the slots 36. By now swinging the lever 35 vertically, th e lever 29 may be swung, thereby winding the springs 14 through the inter- By forcing the eszsoa mediacy of the shaft 13, ratchet wheeels26 and pawls 30. After the springs are wound, the lever 35 is forced rearwardly so that the pin 37 will pass out of the slots 36, at which time the lever is swung downwardly to the 7 vertical positio shown in solid lines-in Fig.

3, in which position it is not in the way of the operator of the sewing machine.

To control the running of the motor, any suitable means may be provided. In the drawings is illustrated a construction in which a pedal 39 is pivoted to the foot portion 7 of the leg. To the pedal is secured the lower end of a rod 40 the upper end 0' which is pivotedv to a horizontal lever 41 pivoted inside the casing portion 8'to one of the walls thereof which is provided with a vertical slot 42 through which extends the lever 41. To the lever 41 at the rear of its pivotal pointis secured the forward end of a strap 43, the rear end of which is secured to one of the vertical walls of the casing portion.8. a I I Secured rigidly on the shaft 11,. within the casing portion 8 isa wheel 44 upon the periphery of which the strap i3 is adapted to hear when the lever 41 is raised at its forward end. The function of the strap 43 is to prevent by its pressure the rotation of. the shaft 11, thus affording a means for holding the motor from running when it is so desired. To normally swing the lever 41 so that the strap l3 shall bear upon. the wheel 44, a coil spring 45 has its lower and secured to the lever l1 forward of the piv- 109 otal point of the lever, the other end of the spring being secured. to the casing-portion 1 8 above the lever ll.

By depressing the pedal 39, the lever 43. is swung against the pressure of the spring 45 so as to release the wheel 45% from the strap 43, upon which, if thesprings 14*. are wound, the motor will run so as to rotate the shaft 11, thereby driving the belt 5, pulley 4 and shaft 3 of the sewing machine. To 119 stop the nunning of the sewing machine, it is but necessary to remove the pressure from the pedal 39, when the spring 45 will swing the lever ll to press the strap 43 against the wheel 44, thereby stopping the motor and 11 sewing machine.

In attaching my attachment to an ordinary sewing machine, it is but necessary to remove one of the legs of the machine and substitute-in its place the attachment. The 120 belt 5 may then be fitted to the two pulleys 4 and 12, and the machine will then be ready to be run by the motor.

By reasonof all the mechanism of themotor being located below the table 1 and connected with the sewing machine pulley 4 by the belt 5, the belt may be quickly tin-own off one of the pulleys and the head swung from its normal position for any desired reason, without danger of the motor 30 mesh with each other opposite sides respectively v the other end being channel form, the opposite sides of the channel having two slots,

ning partsrof the motor is made by a belt instead of by gear wheels, there is no liability of the gear wheels getting out of proper when the head is swung to and fro. My invention may be modified in many ways, within the scope of the appended claims, without departing from its spirit.

Having thus described my invention, what I claim and desire to secure by Letters Patent, is

1. In a sewing machine motor, the coinbination with a casing adapted to be secured to and support the table of a sewing machine, of a shaft rotatively mounted in and having its ends extending through opposite sides of the casing, two ratchet wheels secured to and rotative with the shaft at opposite sides of the casing, a lever having at one end two arms pivoted to saldshaft at of sand caslng,

said channel sides having forward of said slots two slots the rear ends of which extend through the edges of the channel sides, an operating barhaving a transverse pin located in said first named slots and having also a transverse pin adapted to enter and move forward in said second named slots wheiithe bar is swung to the proper posi tion, a spring for forcing the bar forward,

two pawls pivoted'to the respective arms of the lever and respectively engaging said ratchet wheels, and two pawls pivoted re spectively to opposite sides of the casing and respectively engaging said ratchet wheels for preventing retrograde rotation of the shaft.

2. In a sewing machine motor, the-combination with a casing, of a shaft rotatively mounted in said casing and having an end projecting through the casing, a lever pivoted to the projecting end of the shaft and having a slot and a longitudinal slot forward of the firstnamed slot and having its rear end extending laterally to the edge of the lever, an operating bar having two transversely projecting pins, one cated in and movable longitu inally in. said first named slot, the other pin being located so as to enter the second named slot when the bar is swung to the proper position, a spring carried by the lever for moving the bar forwardly, a ratchet wheel secured to and rotative with said shaft, a pawl carried by the lever and engaging said ratchet wheel, and a second pawl pivoted to the cas ing and engaging said ratchet wheel to prevent retrograde rotation of the shaft.

In testimony whereof I have signed my name to this specification in presence of two subscribing witnesses.

ROBERT F. HOWARD. l Vitnesses j E. B. House, W. V. Downer.

in being lo- 

